Male anal anatomy
The final segment of the rectum, the ampulla , relaxes to accumulate and temporarily store faeces until defecation occurs. It is continuous with the anal canal; which passes through the pelvic floor to end as the anus. In the superior third of the rectum, the anterior surface and lateral sides are covered by peritoneum. In females, the peritoneum reflects to the posterior vagina and cervix, forming the rectouterine pouch pouch of Douglas. Fig 2 — The peritoneal reflections of the rectum in males A and females B.
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In humans , the anus from Latin anus meaning "ring", "circle"   is the external opening of the rectum. Two sphincters control the exit of feces from the body during an act of defecation , which is the primary function of the anus. These are the internal anal sphincter and the external anal sphincter , which are circular muscles that normally maintain constriction of the orifice and which relaxes as required by normal physiological functioning. The inner sphincter is involuntary and the outer is voluntary. It is located behind the perineum which is located behind the vagina or scrotum.
Your anus is located on your backside, between your butt checks. Your anus is closed off by two rings of muscle: the internal anal sphincter and the external anal sphincter. Around the anus there are 'corpora cavernosa' or masses of erectile tissue that prevent moisture and air from escaping unintentionally. The anus is the last part of the rectum.